Coding Second- and Third-order Vessels. A vascular family is just that: a family, with vessels branching from a common origin to form a “family tree.”. As an example, the brachiocephalic is a first-order vessel, or a “child” of the aorta (in this example, the aorta is our Eve). The brachiocephalic has two children, the right axillary ... More @Wikipedia
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